[Beowulf] Woodcrest Memory bandwidth
jholmes at psu.edu
Mon Aug 14 07:29:38 PDT 2006
Here's a 4 core Woodcrest system with 4 sticks of 2 GB 667 MHz FB-dimms:
Function Rate (MB/s) Avg time Min time Max time
Copy: 4813.2590 0.2663 0.2659 0.2675
Scale: 4826.2181 0.2656 0.2652 0.2662
Add: 5244.0135 0.3664 0.3661 0.3669
Triad: 5244.3106 0.3665 0.3661 0.3671
This was a pathscale compiled stream executable with openmp using 4 threads.
Bill Broadley wrote:
> I have a theory that the 533 MHz FB dimms have a severe performance
> penalty on 1333 MHz FSB.
> Does anyone out there have a 1333 MHz FSB dual woodcrest (pick your
> vendor) with 4 667 MHz FB-dimms? A 1066 MHz FSB with 4 533 MHz dimms
> would also be interesting.
> Could you run: http://www.cs.virginia.edu/stream/ ?
> Ideally compiled with a F90 or C compiler (Intel, Pathscale, and I imagine
> many others) that support OpenMP so you can run 4 threads (one per core)
> in parallel.
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